Calculators

Calculate percentages quickly: increase, discount, ratio and percentage change. 4 calculation modes with instant results. Free online calculator.

Convert decimal numbers to Roman numerals and vice versa. Supports values from 1 to 3,999,999 with vinculum notation. Instant result — use now.

Calculate worked hours, overtime (50% and 100%) and time bank. Supports night shifts and Brazilian CLT rules. Output in HH:MM and decimal format.

Calculate direct and inverse rule of three online. Instant result, 100% free, no signup required.

Calculate business days between two dates considering Brazilian national holidays. 100% free.

Calculate the amount of meat, drinks, charcoal and sides for your barbecue. By number of guests. 100% free.

Calculate your exact age in years, months, days and hours. Know how many days until your next birthday. 100% free.

Calculate fraction operations: addition, subtraction, multiplication, division and simplification. Instant results.

Calculate the Least Common Multiple (LCM) of two or more numbers. Step-by-step results. 100% free.

Calculate the Greatest Common Divisor (GCD) of two or more numbers. Step-by-step results. 100% free.

Calculate exact probability distribution for any dice notation (3d6+2). Bar chart, cumulative probability, advantage/disadvantage.

Calculate your vehicle fuel consumption in L/100km, km/L, and MPG. Metric and imperial units. Optional cost per km calculation. Free.